/Engine/Source/Runtime/Core/Public/Math/GenericOctree.h
Determines which of the octree node's children contain the whole bounding box, if any.
The octree's node that the bounding box is farthest from the outside edge of, or an invalid node ref if it's not contained by any of the children.
[FOctreeChildNodeRef](API\Runtime\Core\Math\FOctreeChildNodeRef) GetContainingChild ( const [FBoxCenterAndExtent](API\Runtime\Core\Math\FBoxCenterAndExtent) & BoundingBox ) const